Wind turbine
First Claim
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1. A wind turbine, comprising:
- a first set of blades at a front location of the wind turbine;
a second set of blades behind the first set of blades;
a folding mechanism that in response to increasing wind velocity allows the second set of blades to fold down toward a back of the wind turbine so that an outer circumference of the second set of blades decreases; and
,a pitch changing mechanism that in response to the second set of blades folding down toward the back of the wind turbine changes a pitch angle of the first set of blades.
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Abstract
A wind turbine includes two sets of blades. A first set of blades is placed at a front location of the wind turbine. A second set of blades is placed behind the first set of blades. The first set of blades turns in an area within a first circumference. The second set of blades are mounted at a location sufficiently away from an axis of rotation of the wind turbine so that the second set of blades turns within an area that is within a second circumference and that is substantially outside the first circumference.
14 Citations
20 Claims
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1. A wind turbine, comprising:
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a first set of blades at a front location of the wind turbine; a second set of blades behind the first set of blades; a folding mechanism that in response to increasing wind velocity allows the second set of blades to fold down toward a back of the wind turbine so that an outer circumference of the second set of blades decreases; and
,a pitch changing mechanism that in response to the second set of blades folding down toward the back of the wind turbine changes a pitch angle of the first set of blades. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for protecting a wind turbine against effects of strong wind comprising:
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placing a first set of blades at a front location of the wind turbine; placing a second set of blades behind the first set of blades; folding the second set of blades down toward a back of the wind turbine so that an outer circumference of the second set of blades decreases in response to increasing wind velocity; and
,changing a pitch angle of the first set of blades to be more parallel to wind direction in response to the folding of the second set of blades down toward the back of the wind turbine. - View Dependent Claims (13, 14)
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15. A wind turbine, comprising:
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a first set of blades at a front location of the wind turbine; a second set of blades behind the first set of blades; a folding mechanism that in response to increasing wind velocity allows the second set of blades to fold down toward a back of the wind turbine so that an outer circumference of the second set of blades decreases; and
,a pitch changing mechanism that allows a pitch angle of the first set of blades to be affected in response to the second set of blades folding down toward the back of the wind turbine. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification